"We need to do the same if we're going to survive, because the enemy is real - it's always been real."

Those "common enemies", as Snow refers to them as, are the powerful White Walkers, who threaten all those in Westeros.

The trailer teases a number of epic battle scenes - with at least one appearing to be between two of the kingdoms, and dragons and boats playing a large part.

But ultimately it appears as though a lot of the fighting will be between the kingdoms and the White Walkers.

"When the snows fall and the white winds blow, the lone wolf dies but the pack survives," Sansa Stark says, all but confirming the kingdoms are coming together.

The seventh season of the series starts much later in the year than previous seasons, and will see cameos from British pop singer Ed Sheeran and UFC superstar Conor McGregor, which are expected to attract a slew of new viewers.